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#1
08-19-2007, 09:24 PM
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Vacuum modulator installation problems.......'81 617
I recently replaced a faulty transmission vacuum modulator on my '81 300D and immediately after I did so I noticed that it would shift WAY too early. I figured that the modulator needed to be adjusted so I tried that. No improvement.
Before I replaced the modulator it shifted very hard and very late with or without the vacuum line attached to it. That is one way I knew it was bad. Now when I remove the vacuum line, it get the same early, low rpm shifts. What gives? Could the transmission have shifted when I removed the cross member that was supporting it? If so, would this cause this problem? I also can't get it to downshift, ever. I never had either of these problems before and they both started IMMEDIATELY after I replaced the vacuum modulator. Any ideas?
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1993 W124 300D -297K on the clock as I type this. Last edited by i-osprey; 08-19-2007 at 09:24 PM. Reason: More info 
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#2
08-19-2007, 09:29 PM
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It might be the bowden cable
The bowden cable determines when to shift based on the throttle position. You might have slipped it off when you were working on the transmission.
It runs from the top of the valve cover to the transmission. I know that on my car after I adjusted it the early shifting issue went away. Loosen it to make the trans shift later.
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"I have no convictions ... I blow with the wind, and the prevailing wind happens to be from Vichy" Current Monika '74 450 SL BrownHilda '79 280SL FoxyCleopatra '99 Chevy Suburban Scarlett 2014 Jeep Cherokee Krystal 2004 Volvo S60 Gone '74 Jeep CJ5 '97 Jeep ZJ Laredo Rudolf ‘86 300SDL Bruno '81 300SD Fritzi '84 BMW '92 Subaru '96 Impala SS '71 Buick GS conv '67 GTO conv '63 Corvair conv '57 Nomad 
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#3
08-19-2007, 09:52 PM
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Quote:
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#4
08-19-2007, 10:52 PM
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It doesn't have a Bowden cable.
Is there something else similar like a pressure control rod or something like that? I can shift through all the gears but I have to do it manually.
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1993 W124 300D -297K on the clock as I type this. Last edited by i-osprey; 08-20-2007 at 12:46 AM.
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#5
08-20-2007, 04:57 AM
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My bad... I thought the '81 had a cable. It does on the W126.
__________________
"I have no convictions ... I blow with the wind, and the prevailing wind happens to be from Vichy" Current Monika '74 450 SL BrownHilda '79 280SL FoxyCleopatra '99 Chevy Suburban Scarlett 2014 Jeep Cherokee Krystal 2004 Volvo S60 Gone '74 Jeep CJ5 '97 Jeep ZJ Laredo Rudolf ‘86 300SDL Bruno '81 300SD Fritzi '84 BMW '92 Subaru '96 Impala SS '71 Buick GS conv '67 GTO conv '63 Corvair conv '57 Nomad
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